Designed to make almost everything automatic, Auto-Tune EFX provides two different flavors of the Auto-Tune Vocal Effect as well as real-time pitch correction. Just select your desired effect type, set the key and scale of your track, and Auto-Tune EFX does the rest. For songs with complex chord progressions or modulations, you can optionally set up custom scales or use your host's automation facility to allow the processing of virtually any vocal line.

Like Auto-Tune Evo, Auto-Tune EFX pitch correction works by continuously tracking the pitch of your vocal and comparing it to the notes in a (customizable) scale. The scale note closest to the input pitch is identified as the target note. If your vocal's pitch exactly matches the target note, no correction is applied. If your vocal's pitch varies from the target note, either sharp or flat, the output pitch is smoothly corrected to the target note

The Auto-Tune Vocal Effect is what is technically known as "pitch quantization." Instead of allowing all of the small variations in pitch and the gradual transitions between notes that are a normal part of singing, the Auto-Tune Vocal Effect limits each note to an exact pitch, stripping out any variation, as well as forcing instantaneous transitions between notes.